Firstly, this paper generally introduces the development of HDTV at home and abroad, and expounds the principle of the OFDM and the COFDM scheme of the HDTV broadcast transmission system.是什么意思_Firstly, this paper generally introduces the development of HDTV at home and abroad, and expounds the principle of the OFDM and the COFDM scheme of the HDTV broadcast transmission system.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句